Friction between teams often arises from deeply misaligned values, not just personality clashes. A "move fast" team measured by DAUs will inevitably conflict with a "reliability" team measured by uptime SLAs. True alignment requires shared goals, not just shared projects.

The fundamental tension between sales and marketing extends beyond KPIs to their core operational perspectives. Marketing operates at a macro level, analyzing broad market trends and brand awareness. In contrast, sales is hyper-focused on the micro level of one-on-one customer interactions. This inherent difference in viewpoint is a primary source of friction.

Technical competence is the easiest part of a technical co-founder to evaluate. The real risks lie in misaligned goals (lifestyle vs. unicorn), personality clashes, and incompatible work styles. Prioritize assessing these crucial "human" factors first.

When everyone on the team shares the same deep understanding of the customer's world, communication can be imperfect. The shared context fills in the gaps, preventing the "translation errors" that plague teams trying to operate from detailed specs alone.

The founder's number one piece of advice is to get the co-founder relationship right. While you can pivot ideas, raise more funding, or change markets, replacing a co-founder is incredibly difficult. A strong, complementary founding team is the foundation for overcoming all other startup challenges.

When smart partners think the other is an idiot, it's often due to a 'base assumption collision.' Each person operates on a different fundamental, unspoken belief about reality ('the world is X'). Identifying and discussing these hidden assumptions is key to resolving otherwise intractable conflicts.

For data-less decisions, PhonePe's co-founders have a simple rule: the partner with deeper historical strength in that domain makes the final call. The other commits fully, and they never revisit the decision, ensuring they learn and move forward without blame.

The greatest friction for co-founder couples arises when they operate in the same domain, such as parenting or co-writing a book. In business, they thrived by establishing clear, non-overlapping responsibilities (e.g., operations vs. sales), which prevented micromanagement and conflict. This specialization is key to their partnership's success.

The founders credit their successful partnership to an equal commitment to hard work. By dividing responsibilities and working independently before collaborating ('divide and conquer'), they ensure an even playing field and avoid the common pitfalls of co-founder burnout or resentment that often ruin business friendships.